How to mend Dhw Vaillant Combi Boiler

how to fix problem?

How can I fix hammer knock in plumbing?

Vailant VCW 242EH, Sticking diverter valve?

cost of new expansion vessel?

hot water out of cold water tap?

vailant 242e turbomax and the temp keeps fluctuating?

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plumbing and heating?

No heating but plenty of hot water ?

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pressure valves?

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valliant gmbh turbo max vuw gb 282/2-5?

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Vaillant ecomax 828/2 e water pressure sensor?

no hot water in taps?

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vailllant turbomax?

438 at low gas rate?

Hot water cools when tap is opened fully?

dhw diaphram?

plumbing?